CVE-2026-40260

Name: CVE-2026-40260
Creator: NVD / NIST
Published: 2026-04-17T01:17:39.733+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.9/10EPSS 0.42%

Last modified Jun 17, 2026

CVE-2026-40260 is a medium-severity vulnerability rated 6.9/10 on the CVSS scale. pypdf is a free and open-source pure-python PDF library. In versions prior to 6.10.0, manipulated XMP metadata entity declarations can exhaust RAM. EPSS estimates a 0.42% chance of exploitation in the next 30 days.

Description

pypdf is a free and open-source pure-python PDF library. In versions prior to 6.10.0, manipulated XMP metadata entity declarations can exhaust RAM. An attacker who exploits this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the XMP metadata. This issue has been fixed in version 6.10.0.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS 4.0

6.9/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.42%

33.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-776

Affected Software

Vendor	Product	Versions
Pypdf Project	Pypdf	< 6.10.0

References

https://github.com/py-pdf/pypdf/commit/b15a374e5ca648d4878e57c3b2c0551e7f8cc7f8Patch
https://github.com/py-pdf/pypdf/pull/3724Issue Tracking, Patch
https://github.com/py-pdf/pypdf/releases/tag/6.10.0Product, Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-3crg-w4f6-42mxMitigation, Patch, Vendor Advisory

Timeline

Published: Apr 17, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-40260?

How severe is CVE-2026-40260?

CVE-2026-40260 has a CVSS score of 6.9/10 (MEDIUM severity). The EPSS model estimates a 0.42% probability of exploitation in the next 30 days.

How do I fix CVE-2026-40260?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-40260?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST